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Grade: 12th pass 

                        
the sum of n terms of an A.P. is 3n 2 +5. the number of term which equals 159 is????
5 years ago

Answers : (1)

aarthi s
19 Points 
							
Tn=Sn-(Sn-1)
Tn=159
Sn=3n^2+5
Sn-1=3(n-1)^2+5
substitute these values and you get 27
5 years ago
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